It's pretty strange, but the upstream fix does not seem to work on Ubuntu, at least not on 24.04. I tried Debian Sid, and there the regular gcc-13 package (13.2.0-24) has no trouble at all with the test case: no alignment issue, no segfaults.
Whereas on Ubuntu 24.04, anything after upstream's https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=28219f7f99a80519d1c6ab5e5dc83b4c7f8d7251 (libsanitizer: merge from upstream) and https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=aaf0f12175bfc0a7bdc6c80b8d481fb09ae44e25 (libsanitizer: Apply local patches) just segfaults, e.g.: Program received signal SIGSEGV, Segmentation fault. 0x00007f5b91d9ba44 in __interception::InterceptFunction (name=0x7f5b91dc5717 "strcat", ptr_to_real=0x7f5b91d44128 <__interception::real_strcat>, func=140031265358128, trampoline=140031265358128) at /home/ubuntu/src/gcc/master/libsanitizer/interception/interception_linux.cpp:62 warning: Source file is more recent than executable. 62 *ptr_to_real = (uptr)addr; (gdb) bt #0 0x00007f5b91d9ba44 in __interception::InterceptFunction (name=0x7f5b91dc5717 "strcat", ptr_to_real=0x7f5b91d44128 <__interception::real_strcat>, func=140031265358128, trampoline=140031265358128) at /home/ubuntu/src/gcc/master/libsanitizer/interception/interception_linux.cpp:62 #1 0x00007f5b91d477d4 in __asan::InitializeAsanInterceptors () at /home/ubuntu/src/gcc/master/libsanitizer/asan/asan_interceptors.cpp:759 #2 0x00007f5b91d5c2b1 in __asan::AsanInitInternal () at /home/ubuntu/src/gcc/master/libsanitizer/asan/asan_rtl.cpp:446 #3 0x00007f5b91d5c819 in __asan_init () at /home/ubuntu/src/gcc/master/libsanitizer/asan/asan_rtl.cpp:626 #4 0x00007f5b92345873 in _dl_init (main_map=0x7f5b923792e0, argc=1, argv=0x7fffed4940b8, env=0x7fffed4940c8) at ./elf/dl-init.c:106 #5 0x00007f5b9235f5a0 in _dl_start_user () from /lib64/ld-linux-x86-64.so.2 #6 0x0000000000000001 in ?? () #7 0x00007fffed495667 in ?? () #8 0x0000000000000000 in ?? () -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2023424 Title: GCC 13 on Lunar exhibits AddressSanitizer/UndefinedBehaviorSanitizer bug that doesn't manifest elsewhere To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-13/+bug/2023424/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
